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+/* Starshatter OpenSource Distribution
+ Copyright (c) 1997-2004, Destroyer Studios LLC.
+ All Rights Reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+ * Neither the name "Destroyer Studios" nor the names of its contributors
+ may be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+ SUBSYSTEM: nGenEx.lib
+ FILE: Scene.cpp
+ AUTHOR: John DiCamillo
+
+
+ OVERVIEW
+ ========
+ A 3D Scene
+*/
+
+#include "MemDebug.h"
+#include "Scene.h"
+#include "Graphic.h"
+#include "Light.h"
+
+void Print(const char* fmt, ...);
+
+// +--------------------------------------------------------------------+
+
+Scene::Scene()
+{ }
+
+Scene::~Scene()
+{
+ background.destroy();
+ foreground.destroy();
+ graphics.destroy();
+ sprites.destroy();
+
+ lights.destroy();
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::AddBackground(Graphic* g)
+{
+ if (g) {
+ if (!background.contains(g))
+ background.append(g);
+
+ g->SetScene(this);
+ }
+}
+
+void
+Scene::DelBackground(Graphic* g)
+{
+ if (g) {
+ background.remove(g);
+ g->SetScene(0);
+ }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::AddForeground(Graphic* g)
+{
+ if (g) {
+ if (!foreground.contains(g))
+ foreground.append(g);
+
+ g->SetScene(this);
+ }
+}
+
+void
+Scene::DelForeground(Graphic* g)
+{
+ if (g) {
+ foreground.remove(g);
+ g->SetScene(0);
+ }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::AddGraphic(Graphic* g)
+{
+ if (g) {
+ if (!graphics.contains(g))
+ graphics.append(g);
+
+ g->SetScene(this);
+ }
+}
+
+void
+Scene::DelGraphic(Graphic* g)
+{
+ if (g) {
+ graphics.remove(g) || // it's gotta be in here somewhere!
+ foreground.remove(g) || // use the logical-or operator to early
+ sprites.remove(g) || // out when we find it...
+ background.remove(g);
+
+ g->SetScene(0);
+ }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::AddSprite(Graphic* g)
+{
+ if (g) {
+ if (!sprites.contains(g))
+ sprites.append(g);
+
+ g->SetScene(this);
+ }
+}
+
+void
+Scene::DelSprite(Graphic* g)
+{
+ if (g) {
+ sprites.remove(g);
+ g->SetScene(0);
+ }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::AddLight(Light* l)
+{
+ if (l) {
+ if (!lights.contains(l))
+ lights.append(l);
+ l->SetScene(this);
+ }
+}
+
+void
+Scene::DelLight(Light* l)
+{
+ if (l) {
+ lights.remove(l);
+ l->SetScene(0);
+ }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+Scene::Collect()
+{
+ ListIter<Graphic> iter = graphics;
+
+ while (++iter) {
+ Graphic* g = iter.value();
+ if (g->Life() == 0) {
+ delete iter.removeItem();
+ }
+ }
+
+ iter.attach(sprites);
+
+ while (++iter) {
+ Graphic* g = iter.value();
+ if (g->Life() == 0) {
+ delete iter.removeItem();
+ }
+ }
+
+ ListIter<Light> iter1 = lights;
+
+ while (++iter1) {
+ Light* l = iter1.value();
+ if (l->Life() == 0) {
+ delete iter1.removeItem();
+ }
+ }
+}
+
+
+// +--------------------------------------------------------------------+
+
+bool
+Scene::IsLightObscured(const Point& obj_pos, const Point& light_pos, double obj_radius, Point* impact_point) const
+{
+ Point dir = light_pos - obj_pos;
+ double len = dir.Normalize();
+
+ Scene* pThis = (Scene*) this; // cast-away const
+ Graphic* g = 0;
+ bool obscured = false;
+
+ ListIter<Graphic> g_iter = pThis->graphics;
+ while (++g_iter && !obscured) {
+ g = g_iter.value();
+
+ if (g->CastsShadow() && !g->Hidden() && !g->IsInfinite()) {
+ double gdist = (g->Location() - obj_pos).length();
+ if (gdist > 0.1 && // different than object being obscured
+ g->Radius() > obj_radius && // larger than object being obscured
+ (g->Radius()*400)/gdist > 10) { // projects to a resonable size
+
+ Point delta = (g->Location() - light_pos);
+
+ if (delta.length() > g->Radius() / 100) { // not the object that is emitting the light
+ Point impact;
+ obscured = g->CheckRayIntersection(obj_pos, dir, len, impact, false) ? true : false;
+
+ if (impact_point)
+ *impact_point = impact;
+ }
+ }
+
+ else if (obj_radius < 0 && gdist < 0.1) { // special case for camera (needed for cockpits)
+ Point delta = (g->Location() - light_pos);
+
+ if (delta.length() > g->Radius() / 100) { // not the object that is emitting the light
+ Point impact;
+ obscured = g->CheckRayIntersection(obj_pos, dir, len, impact, false) ? true : false;
+ }
+ }
+ }
+ }
+
+ g_iter.attach(pThis->foreground);
+ while (++g_iter && !obscured) {
+ g = g_iter.value();
+
+ if (g->CastsShadow() && !g->Hidden()) {
+ double gdist = (g->Location() - obj_pos).length();
+ if (gdist > 0.1 && // different than object being obscured
+ g->Radius() > obj_radius && // larger than object being obscured
+ (g->Radius()*400)/gdist > 10) { // projects to a resonable size
+
+ Point delta = (g->Location() - light_pos);
+
+ if (delta.length() > g->Radius() / 100) { // not the object that is emitting the light
+ Point impact;
+ obscured = g->CheckRayIntersection(obj_pos, dir, len, impact, false) ? true : false;
+
+ if (impact_point)
+ *impact_point = impact;
+ }
+ }
+
+ else if (obj_radius < 0 && gdist < 0.1) { // special case for camera (needed for cockpits)
+ Point delta = (g->Location() - light_pos);
+
+ if (delta.length() > g->Radius() / 100) { // not the object that is emitting the light
+ Point impact;
+ obscured = g->CheckRayIntersection(obj_pos, dir, len, impact, false) ? true : false;
+ }
+ }
+ }
+ }
+
+ return obscured;
+}
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